If Sin72=A, then Sin18=?
1 Answer
May 1, 2018
Explanation:
We know that
#sin18 = sin(90 - 72)#
#sin18 = sin90cos(72)- sin(72)cos(90)#
#sin18 = cos(72)#
#sin18 = sqrt(1 - sin^2(72))#
#sin18 = sqrt(1 - A^2)#
Hopefully this helps!
